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MIME Type Checker
Upload a file to check its MIME type and compare it with the extension and file header.
Check the MIME type reported for a file and compare it with the extension and file header.
MIME Type Checker
Drag and drop your file here.
Results will appear here
Choose a file to see the result.
Suggested next step
These tools are the most likely next step after the page you are on now.
What this tool checks
Use this page when a file looks mislabeled, refuses to upload, or behaves differently from what its name suggests.
- The checker reads the MIME type exposed by the browser, compares it with the filename extension, and pairs the result with a simple signature check when possible.
- That helps you tell the difference between what a file is called and what it appears to be.
For many common files, the file stays on your device while the tool runs. No account is required.
How to use it
- 1Upload the file
- 2Compare the reported MIME type with the extension and signature
- 3Use a related tool if you need a deeper file check
What the results show
- A mismatch between extension and MIME type can signal a renamed file or a broken export.
- Unknown MIME means the browser could not classify the file confidently.
Key terms
Frequently asked questions
What is the difference between a MIME type and a file signature?
A MIME type is a content classification label, while a file signature is a byte-level header pattern that can help identify a format.
What file formats does this tool support?
MIME Type Checker works with: Most common file types.
What is this tool used for?
Use it for: Investigate a mislabeled file, Confirm a content type before upload and Understand why an application may reject a file.